Motorcycle Thread - Page 67 - Cut-Weld-Drive Forums

**V8Transporter** · October 3rd, 2010, 10:56 AM

And speaking of Motorcycles again. Friday, I rode the Tiger 140 miles to Auburn Fairgrounds for the AMA Flat Track races. I hadn't seen this type of racing in about ten years. A buddy had ridden his R90S up from San Jose and we met for dinner. Parking was four bucks but the parking guy nodded to Russ and I on our bikes and said "How 'bout a buck each?"

They had a motorcycle parking area which was packed.

The track was an 1/8th mile which made the racing really close. Between the qualifying races there were kids races with what looked like five year olds hustling around the track, though not really going fast enough for them to have a foot down for effect, but really cute. A slightly older class with five riders ran a little quicker. The qualifying and main events were great to watch with some pretty close races and some (I don't use this word very often) amazing riding. The crowd was mostly local and the stands about 7/8ths full. The announcer knew everybody and there were pretty umbrella girls and a couple of leggy brunettes carrying the heat numbers (denoting each race, you perverts). One rider wearing and slime lime colored helmet had his own cheering section heavily populated with entusastic young women waving color matched slime lime flags. Lots of families were having a night out, there were lots of teenagers and the folks were friendly.

I got home about two in the morning on Saturday.

**Unkl Ian** · October 3rd, 2010, 11:30 AM

Went to a local vintage bike swap today.
Pretty cool, no junk.

Bobsmyuncle · October 3rd, 2010, 11:53 AM

Where was that Unk? Would've been a good way to spend the day.

fungus · October 3rd, 2010, 02:05 PM

V8, sounds like an awesome experience. Glad you had fun! Too bad you don't have any pics of those leggy brune- err, motorcycles.

**Unkl Ian** · October 3rd, 2010, 02:09 PM

Quote:

Originally Posted by Bobsmyuncle

Where was that Unk? Would've been a good way to spend the day.

Milton. It was small, but serious.

**Unkl Ian** · October 3rd, 2010, 05:53 PM

**V8Transporter** · October 4th, 2010, 11:50 AM

Hey Fungus. Nope, no pics. But it was entertaining watching the girls when they first walked out to the dirt infield in four inch heels. Tallk about low speed wobble.

**V8Transporter** · October 4th, 2010, 07:44 PM

Wow, those are really tiny people....

**Unkl Ian** · October 5th, 2010, 07:45 AM

New TV show: Cafe Racer

FBB · October 5th, 2010, 01:32 PM

Looks good. Probably won't get it this side of the Pond until next October though.

Turbo Punk · October 5th, 2010, 05:17 PM

Is anybody able to record it to DVD? We don't have HD theatre so can't get it.

I read about it in Cafe Racer magazine and have been trying to find a way to get it.

JiI · October 5th, 2010, 06:38 PM

Quote:

Originally Posted by Turbo Punk

Is anybody able to record it to DVD? We don't have HD theatre so can't get it.

I read about it in Cafe Racer magazine and have been trying to find a way to get it.

Same here. I'd love to see it. My wife would kill me if I got a bike, but you never know...

Jeff

fungus · October 5th, 2010, 07:24 PM

Bought the rear wheel off of a '79 CB 750, which has a different definition on the sprocket teeth. So I'll be making my own for it. Milling out a front sprocket is out, as I can't cut the splines inside accurately.

'77 front sprocket

'79 front sprocket

'77 rear sprocket

'79 rear sprocket

As far as modifying one of the sprockets to work, I could possibly drill out a '79 front sprocket to a given diameter, then cut down the outside of a '77 front sprocket to the same size, bevel the edges and press them together, then weld them.
Or, I could adapt the '77 sprocket to the '79 wheel. I could make an aluminum disc that would make up the bore gap so that the sprocket would seat correctly on the sprocket shaft on the wheel, then drill a new pattern on the '77 sprocket. Actually, if I did that, it wouldn't leave much meat around the bolts holding the sprocket on... I could do similar to the front sprocket, by making a steel disc to take up the bore gap, then weld it in place and drill out the new holes.

Honestly though, it'll be way more accurate to just mill the whole thing out of some mild steel and roll with it. I'll bastard the two together tomorrow on solidworks, then I'll mill it out later in the semester. The rear wire wheel is fine, so I'll use it until I get the other one going. I'll need to make some spacers for the rear axle too.

**V8Transporter** · October 5th, 2010, 08:51 PM

Why do you want to go with the `79 wheel and have to deal with the sprocket situation?

(asks the guy with the Kawasaki mags on his Sportster

)

Turbo Punk · October 6th, 2010, 02:39 AM

Rear disc brake? Or did those come out in '80?

fungus · October 6th, 2010, 09:56 AM

Rear disc came out in '80 from my understanding... This is a drum, and frankly, I don't want to fool around with rear disc. The '79 wheel matches the '81 front wheel I've got. I actually really like the way the comstars look! Also, I got it complete with the brake assembly, good pads, good tire and good bearings for $30.

Any rear comstar that I've seen has a different sprocket, so I'll work with what I can.

**Unkl Ian** · October 6th, 2010, 01:53 PM

http://www.youtube.com/watch?v=MrdXS...layer_embedded

THIS looks excellent.

Turbo Punk · October 6th, 2010, 02:15 PM

Quote:

Originally Posted by fungus

I got it complete with the brake assembly, good pads, good tire and good bearings for $30.

Any rear comstar that I've seen has a different sprocket, so I'll work with what I can.

That's a friggin sweet deal!

Nice score!

fungus · October 6th, 2010, 07:48 PM

Here's a little update:

Front wheel... Gotta say they're growing on me! I almost like them better than wire wheels.

.033" gap.

Had to make different spacers, and in the process bypassed the speedo drive. I would've had to adapt the one from the '77 to fit, and it was on the verge of being too wide to center the wheel. I don't have any pics of the spacers right now... I'll post the info in case anyone else would like to go the same route.

The carbs are too close to one of the frame tubes for me to run pod air filters, and I didn't want to throw the money at them anyway. I didn't like the stock filter box, so I bought a cheapie cone air filter and made a billet adapter over at school:

I normally don't do cone air filters, but folks normally stick them way out so that they're all gaudy. I tried to make it a bit low key. Pretty happy with it.

Also welded up the seat pan. Need to do the actual seat portion now.

The camera hides a lot of baaad stuff.

Welding .125" aluminum with a stick welder isn't exactly my cup of tea.

Turbo Punk · October 7th, 2010, 02:05 AM

A lot of nice work there man.

I hope I can clean out my garage this weekend so I can get started on mine.

I got one of my Hayabusa rearsets in the mail yesterday. I hope the other one arrives today. I plan on adapting them to the CB750.

fungus · October 7th, 2010, 06:18 AM

Quote:

Originally Posted by Turbo Punk

A lot of nice work there man.

I hope I can clean out my garage this weekend so I can get started on mine.

I got one of my Hayabusa rearsets in the mail yesterday. I hope the other one arrives today. I plan on adapting them to the CB750.

Yeah, I'm looking forward to seeing how you do it! Was the 'Busa hydraulic rear brake, or lever? I'm trying to figure out exactly how to do mine right now, because the stock brake pedal is loooong. I'm afraid that if I go with a short pedal, it'll reduce the leverage and thus drastically reduce the rear braking power. I'll be riding hunched over for a while. I've actually considered buying a disc brake rear wheel, so that it's hydraulically actuated. Then the brake pedal is a lot shorter. Maybe I'm just overcomplicating things though... A lot of people seem to have no problem just rolling with a really short brake pedal.

Do folks normally shorten their clutch/throttle cables somehow? No matter how I route mine, they get extremely stiff since I've put on the clipons. They're not kinked, but still are very stiff. They worked fine on the stock bars.

Turbo Punk · October 7th, 2010, 10:11 AM

The 'busa's are lever's. I'm gonna have to figure out the positioning of the connecting rod mount though. I'll take some pics and show you what I have in mind. I'm sure I'll have to change things once I actually look at the bike and match the resrsets up to it.

I do think I have a solid plan though.

Turbo Punk · October 7th, 2010, 02:26 PM

Well, the plan turns out not to be that solid. I matched up the Hayabusa rearsets and they will have to be mounted 3" away from the frame. I'll have to come up with something to make this possible. I'll also have to do some research to see how others have done it.

I'll be posting in my build thread as I find things out.

fungus · October 7th, 2010, 03:02 PM

Dang, that sucks! Does the rod ear go on the other side of the frame from the footpegs? (Like the footpegs are on the outside of the frame, and the rod ear is actuated through the shaft to the interior of the frame)

A guy on another forum answered my question about shortening the cables; Here's a couple of super helpful videos.

http://www.youtube.com/watch?v=F-gY27LTU2c

http://www.youtube.com/watch?v=0y27QZOCl50

Still need to figure out my front brake caliper situation. I thought the calipers I bought had opposing dual pistons. Actually, they have dual pistons on the same side. I could just make a caliper bracket that pivots at the fork like the stock '77 brakes; but, that would cause the pads to wear at an angle. I need to come up with something that will allow the caliper to slide on the end of the mount. Just seeing a stock '83 nighthawk caliper bracket would help a lot...

Turbo Punk · October 7th, 2010, 06:39 PM

I posted pics in my build thread so as not to clog up this one. I'll post the Hayabusa right rearset pics now.